cmd/eeprom.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2000, 2001
   4  * Wolfgang Denk, DENX Software Engineering, [email protected].
   5  */
   6
   7 /*
   8  * Support for read and write access to EEPROM like memory devices. This
   9  * includes regular EEPROM as well as  FRAM (ferroelectic nonvolaile RAM).
  10  * FRAM devices read and write data at bus speed. In particular, there is no
  11  * write delay. Also, there is no limit imposed on the number of bytes that can
  12  * be transferred with a single read or write.
  13  *
  14  * Use the following configuration options to ensure no unneeded performance
  15  * degradation (typical for EEPROM) is incured for FRAM memory:
  16  *
  17  * #define CONFIG_SYS_I2C_FRAM
  18  * Set CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS to 0
  19  *
  20  */
  21
  22 #include <common.h>
  23 #include <config.h>
  24 #include <command.h>
  25 #include <dm.h>
  26 #include <eeprom.h>
  27 #include <i2c.h>
  28 #include <i2c_eeprom.h>
  29 #include <eeprom_layout.h>
  30 #include <linux/delay.h>
  31
  32 #ifndef I2C_RXTX_LEN
  33 #define I2C_RXTX_LEN    128
  34 #endif
  35
  36 #define EEPROM_PAGE_SIZE        (1 << CONFIG_SYS_EEPROM_PAGE_WRITE_BITS)
  37 #define EEPROM_PAGE_OFFSET(x)   ((x) & (EEPROM_PAGE_SIZE - 1))
  38
  39 #if CONFIG_IS_ENABLED(DM_I2C)
  40 static int eeprom_i2c_bus;
  41 #endif
  42
  43 __weak int eeprom_write_enable(unsigned dev_addr, int state)
  44 {
  45         return 0;
  46 }
  47
  48 void eeprom_init(int bus)
  49 {
  50         /* I2C EEPROM */
  51 #if CONFIG_IS_ENABLED(DM_I2C)
  52         eeprom_i2c_bus = bus;
  53 #elif CONFIG_IS_ENABLED(SYS_I2C_LEGACY)
  54         if (bus >= 0)
  55                 i2c_set_bus_num(bus);
  56         i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
  57 #endif
  58 }
  59
  60 /*
  61  * for CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 2 (16-bit EEPROM address) offset is
  62  *   0x000nxxxx for EEPROM address selectors at n, offset xxxx in EEPROM.
  63  *
  64  * for CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 1 (8-bit EEPROM page address) offset is
  65  *   0x00000nxx for EEPROM address selectors and page number at n.
  66  */
  67 static int eeprom_addr(unsigned dev_addr, unsigned offset, uchar *addr)
  68 {
  69         unsigned blk_off;
  70         int alen;
  71
  72         blk_off = offset & 0xff;        /* block offset */
  73 #if CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 1
  74         addr[0] = offset >> 8;          /* block number */
  75         addr[1] = blk_off;              /* block offset */
  76         alen = 2;
  77 #else
  78         addr[0] = offset >> 16;         /* block number */
  79         addr[1] = offset >>  8;         /* upper address octet */
  80         addr[2] = blk_off;              /* lower address octet */
  81         alen = 3;
  82 #endif  /* CONFIG_SYS_I2C_EEPROM_ADDR_LEN */
  83
  84         addr[0] |= dev_addr;            /* insert device address */
  85
  86         return alen;
  87 }
  88
  89 static int eeprom_len(unsigned offset, unsigned end)
  90 {
  91         unsigned len = end - offset;
  92
  93         /*
  94          * For a FRAM device there is no limit on the number of the
  95          * bytes that can be accessed with the single read or write
  96          * operation.
  97          */
  98 #if !defined(CONFIG_SYS_I2C_FRAM)
  99         unsigned blk_off = offset & 0xff;
 100         unsigned maxlen = EEPROM_PAGE_SIZE - EEPROM_PAGE_OFFSET(blk_off);
 101
 102         if (maxlen > I2C_RXTX_LEN)
 103                 maxlen = I2C_RXTX_LEN;
 104
 105         if (len > maxlen)
 106                 len = maxlen;
 107 #endif
 108
 109         return len;
 110 }
 111
 112 static int eeprom_rw_block(unsigned offset, uchar *addr, unsigned alen,
 113                            uchar *buffer, unsigned len, bool read)
 114 {
 115         int ret = 0;
 116
 117 #if CONFIG_IS_ENABLED(DM_I2C)
 118         struct udevice *dev;
 119
 120         ret = i2c_get_chip_for_busnum(eeprom_i2c_bus, addr[0],
 121                                       alen - 1, &dev);
 122         if (ret) {
 123                 printf("%s: Cannot find udev for a bus %d\n", __func__,
 124                        eeprom_i2c_bus);
 125                 return CMD_RET_FAILURE;
 126         }
 127
 128         if (read)
 129                 ret = dm_i2c_read(dev, offset, buffer, len);
 130         else
 131                 ret = dm_i2c_write(dev, offset, buffer, len);
 132
 133 #else /* Non DM I2C support - will be removed */
 134
 135         if (read)
 136                 ret = i2c_read(addr[0], offset, alen - 1, buffer, len);
 137         else
 138                 ret = i2c_write(addr[0], offset, alen - 1, buffer, len);
 139 #endif /* CONFIG_DM_I2C */
 140         if (ret)
 141                 ret = CMD_RET_FAILURE;
 142
 143         return ret;
 144 }
 145
 146 static int eeprom_rw(unsigned dev_addr, unsigned offset, uchar *buffer,
 147                      unsigned cnt, bool read)
 148 {
 149         unsigned end = offset + cnt;
 150         unsigned alen, len;
 151         int rcode = 0;
 152         uchar addr[3];
 153
 154 #if !CONFIG_IS_ENABLED(DM_I2C) && defined(CONFIG_SYS_I2C_EEPROM_BUS)
 155         eeprom_init(CONFIG_SYS_I2C_EEPROM_BUS);
 156 #endif
 157
 158         while (offset < end) {
 159                 alen = eeprom_addr(dev_addr, offset, addr);
 160
 161                 len = eeprom_len(offset, end);
 162
 163                 rcode = eeprom_rw_block(offset, addr, alen, buffer, len, read);
 164
 165                 buffer += len;
 166                 offset += len;
 167
 168 #if CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS > 0
 169                 if (!read)
 170                         udelay(CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS * 1000);
 171 #endif
 172         }
 173
 174         return rcode;
 175 }
 176
 177 int eeprom_read(unsigned dev_addr, unsigned offset, uchar *buffer, unsigned cnt)
 178 {
 179         /*
 180          * Read data until done or would cross a page boundary.
 181          * We must write the address again when changing pages
 182          * because the next page may be in a different device.
 183          */
 184         return eeprom_rw(dev_addr, offset, buffer, cnt, 1);
 185 }
 186
 187 int eeprom_write(unsigned dev_addr, unsigned offset,
 188                  uchar *buffer, unsigned cnt)
 189 {
 190         int ret;
 191
 192         eeprom_write_enable(dev_addr, 1);
 193
 194         /*
 195          * Write data until done or would cross a write page boundary.
 196          * We must write the address again when changing pages
 197          * because the address counter only increments within a page.
 198          */
 199         ret = eeprom_rw(dev_addr, offset, buffer, cnt, 0);
 200
 201         eeprom_write_enable(dev_addr, 0);
 202         return ret;
 203 }
 204
 205 static long parse_numeric_param(char *str)
 206 {
 207         char *endptr;
 208         long value = simple_strtol(str, &endptr, 16);
 209
 210         return (*endptr != '\0') ? -1 : value;
 211 }
 212
 213 struct eeprom_dev_spec {
 214 #if CONFIG_IS_ENABLED(I2C_EEPROM)
 215         struct udevice *dev;
 216 #endif
 217         int i2c_bus;
 218         ulong i2c_addr;
 219 };
 220
 221 static void eeprom_dev_spec_init(struct eeprom_dev_spec *dev)
 222 {
 223 #if CONFIG_IS_ENABLED(I2C_EEPROM)
 224         if (!dev->dev)
 225 #endif
 226                 eeprom_init(dev->i2c_bus);
 227 }
 228
 229 static int eeprom_dev_spec_read(struct eeprom_dev_spec *dev,
 230                                 unsigned offset, uchar *buffer, unsigned cnt)
 231 {
 232 #if CONFIG_IS_ENABLED(I2C_EEPROM)
 233         if (dev->dev)
 234                 return i2c_eeprom_read(dev->dev, offset, buffer, cnt);
 235 #endif
 236         return eeprom_read(dev->i2c_addr, offset, buffer, cnt);
 237 }
 238
 239 static int eeprom_dev_spec_write(struct eeprom_dev_spec *dev,
 240                                  unsigned offset, uchar *buffer, unsigned cnt)
 241 {
 242 #if CONFIG_IS_ENABLED(I2C_EEPROM)
 243         if (dev->dev)
 244                 return i2c_eeprom_write(dev->dev, offset, buffer, cnt);
 245 #endif
 246         return eeprom_write(dev->i2c_addr, offset, buffer, cnt);
 247 }
 248
 249 /**
 250  * parse_eeprom_dev_spec - parse the eeprom device specifier
 251  *
 252  * @dev:        pointer to eeprom device specifier
 253  * @argc:       count of command line arguments that can be used to parse
 254  *              the device specifier
 255  * @argv:       command line arguments left to parse
 256  *
 257  * @returns:    number of arguments parsed or CMD_RET_USAGE if error
 258  */
 259 static int parse_eeprom_dev_spec(struct eeprom_dev_spec *dev, int argc,
 260                                  char *const argv[])
 261 {
 262 #if CONFIG_IS_ENABLED(I2C_EEPROM)
 263         if (argc == 0) {
 264                 if (!uclass_first_device_err(UCLASS_I2C_EEPROM, &dev->dev))
 265                         return 0;
 266         }
 267
 268         if (argc == 1) {
 269                 if (!uclass_get_device_by_name(UCLASS_I2C_EEPROM, argv[0],
 270                                                &dev->dev))
 271                         return 1;
 272
 273                 /*
 274                  * If we could not find the device by name and the parameter is
 275                  * not numeric (and so won't be handled later), fail.
 276                  */
 277                 if (parse_numeric_param(argv[0]) == -1) {
 278                         printf("Can't get eeprom device: %s\n", argv[0]);
 279                         return CMD_RET_USAGE;
 280                 }
 281         }
 282 #endif
 283
 284 #ifdef CONFIG_SYS_I2C_EEPROM_ADDR
 285         if (argc == 0) {
 286                 dev->i2c_bus = -1;
 287                 dev->i2c_addr = CONFIG_SYS_I2C_EEPROM_ADDR;
 288
 289                 return 0;
 290         }
 291 #endif
 292         if (argc == 1) {
 293                 dev->i2c_bus = -1;
 294                 dev->i2c_addr = parse_numeric_param(argv[0]);
 295
 296                 return 1;
 297         }
 298
 299         if (argc == 2) {
 300                 dev->i2c_bus = parse_numeric_param(argv[0]);
 301                 dev->i2c_addr = parse_numeric_param(argv[1]);
 302
 303                 return 2;
 304         }
 305
 306         return CMD_RET_USAGE;
 307 }
 308
 309 #ifdef CONFIG_CMD_EEPROM_LAYOUT
 310
 311 #ifdef CONFIG_EEPROM_LAYOUT_VERSIONS
 312 __weak int eeprom_parse_layout_version(char *str)
 313 {
 314         return LAYOUT_VERSION_UNRECOGNIZED;
 315 }
 316 #endif
 317
 318 static unsigned char eeprom_buf[CONFIG_SYS_EEPROM_SIZE];
 319
 320 #endif
 321
 322 enum eeprom_action {
 323         EEPROM_LIST,
 324         EEPROM_READ,
 325         EEPROM_WRITE,
 326         EEPROM_PRINT,
 327         EEPROM_UPDATE,
 328         EEPROM_ACTION_INVALID,
 329 };
 330
 331 static enum eeprom_action parse_action(char *cmd)
 332 {
 333 #if CONFIG_IS_ENABLED(I2C_EEPROM)
 334         if (!strncmp(cmd, "list", 4))
 335                 return EEPROM_LIST;
 336 #endif
 337         if (!strncmp(cmd, "read", 4))
 338                 return EEPROM_READ;
 339         if (!strncmp(cmd, "write", 5))
 340                 return EEPROM_WRITE;
 341 #ifdef CONFIG_CMD_EEPROM_LAYOUT
 342         if (!strncmp(cmd, "print", 5))
 343                 return EEPROM_PRINT;
 344         if (!strncmp(cmd, "update", 6))
 345                 return EEPROM_UPDATE;
 346 #endif
 347
 348         return EEPROM_ACTION_INVALID;
 349 }
 350
 351 #if CONFIG_IS_ENABLED(I2C_EEPROM)
 352 static int do_eeprom_list(void)
 353 {
 354         struct udevice *dev;
 355         struct uclass *uc;
 356         int err;
 357
 358         err = uclass_get(UCLASS_I2C_EEPROM, &uc);
 359         if (err)
 360                 return CMD_RET_FAILURE;
 361
 362         uclass_foreach_dev(dev, uc)
 363                 printf("%s (%s)\n", dev->name, dev->driver->name);
 364
 365         return CMD_RET_SUCCESS;
 366 }
 367 #endif
 368
 369 static int do_eeprom_rw(struct eeprom_dev_spec *dev, bool read,
 370                         ulong addr, ulong off, ulong cnt)
 371 {
 372         const char *const fmt =
 373                 "\nEEPROM @0x%lX %s: addr 0x%08lx  off 0x%04lx  count %ld ... ";
 374         uchar *memloc = (uchar *)addr;
 375         int ret;
 376
 377         printf(fmt, dev->i2c_addr, read ? "read" : "write", addr, off, cnt);
 378         if (read)
 379                 ret = eeprom_dev_spec_read(dev, off, memloc, cnt);
 380         else
 381                 ret = eeprom_dev_spec_write(dev, off, memloc, cnt);
 382         puts("done\n");
 383
 384         return ret;
 385 }
 386
 387 #ifdef CONFIG_CMD_EEPROM_LAYOUT
 388
 389 static int do_eeprom_layout(struct eeprom_dev_spec *dev, int layout_ver,
 390                             struct eeprom_layout *layout)
 391 {
 392         eeprom_layout_setup(layout, eeprom_buf, CONFIG_SYS_EEPROM_SIZE,
 393                             layout_ver);
 394
 395         return eeprom_dev_spec_read(dev, 0, eeprom_buf, layout->data_size);
 396 }
 397
 398 static int do_eeprom_print(struct eeprom_dev_spec *dev, int layout_ver)
 399 {
 400         struct eeprom_layout layout;
 401         int ret;
 402
 403         ret = do_eeprom_layout(dev, layout_ver, &layout);
 404         if (ret)
 405                 return ret;
 406
 407         layout.print(&layout);
 408
 409         return 0;
 410 }
 411
 412 static int do_eeprom_update(struct eeprom_dev_spec *dev, int layout_ver,
 413                             char *key, char *value)
 414 {
 415         struct eeprom_layout layout;
 416         int ret;
 417
 418         ret = do_eeprom_layout(dev, layout_ver, &layout);
 419         if (ret)
 420                 return ret;
 421
 422         ret = layout.update(&layout, key, value);
 423         if (ret)
 424                 return CMD_RET_FAILURE;
 425
 426         return eeprom_dev_spec_write(dev, 0, layout.data, layout.data_size);
 427 }
 428
 429 #endif
 430
 431 static int eeprom_action_expected_argc(enum eeprom_action action)
 432 {
 433         switch (action) {
 434         case EEPROM_LIST:
 435                 return 0;
 436         case EEPROM_READ:
 437         case EEPROM_WRITE:
 438                 return 3;
 439         case EEPROM_PRINT:
 440                 return 0;
 441         case EEPROM_UPDATE:
 442                 return 2;
 443         default:
 444                 return CMD_RET_USAGE;
 445         }
 446 }
 447
 448 #define NEXT_PARAM(argc, index) { (argc)--; (index)++; }
 449 int do_eeprom(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 450 {
 451         enum eeprom_action action = EEPROM_ACTION_INVALID;
 452         struct eeprom_dev_spec dev;
 453         ulong addr = 0, cnt = 0, off = 0;
 454         int ret, index = 0;
 455 #ifdef CONFIG_CMD_EEPROM_LAYOUT
 456         char *field_name = "";
 457         char *field_value = "";
 458         int layout_ver = LAYOUT_VERSION_AUTODETECT;
 459 #endif
 460
 461         if (argc <= 1)
 462                 return CMD_RET_USAGE;
 463
 464         NEXT_PARAM(argc, index); /* Skip program name */
 465
 466         action = parse_action(argv[index]);
 467         NEXT_PARAM(argc, index);
 468
 469         if (action == EEPROM_ACTION_INVALID)
 470                 return CMD_RET_USAGE;
 471
 472 #if CONFIG_IS_ENABLED(I2C_EEPROM)
 473         if (action == EEPROM_LIST)
 474                 return do_eeprom_list();
 475 #endif
 476
 477 #ifdef CONFIG_EEPROM_LAYOUT_VERSIONS
 478         if (action == EEPROM_PRINT || action == EEPROM_UPDATE) {
 479                 if (!strcmp(argv[index], "-l")) {
 480                         NEXT_PARAM(argc, index);
 481                         layout_ver = eeprom_parse_layout_version(argv[index]);
 482                         NEXT_PARAM(argc, index);
 483                 }
 484         }
 485 #endif
 486
 487         ret = parse_eeprom_dev_spec(&dev,
 488                                     argc - eeprom_action_expected_argc(action),
 489                                     argv + index);
 490         if (ret == CMD_RET_USAGE)
 491                 return ret;
 492
 493         while (ret--)
 494                 NEXT_PARAM(argc, index);
 495
 496         if (action == EEPROM_READ || action == EEPROM_WRITE) {
 497                 addr = parse_numeric_param(argv[index]);
 498                 NEXT_PARAM(argc, index);
 499                 off = parse_numeric_param(argv[index]);
 500                 NEXT_PARAM(argc, index);
 501                 cnt = parse_numeric_param(argv[index]);
 502         }
 503
 504 #ifdef CONFIG_CMD_EEPROM_LAYOUT
 505         if (action == EEPROM_UPDATE) {
 506                 field_name = argv[index];
 507                 NEXT_PARAM(argc, index);
 508                 field_value = argv[index];
 509                 NEXT_PARAM(argc, index);
 510         }
 511 #endif
 512
 513         eeprom_dev_spec_init(&dev);
 514
 515         switch (action) {
 516         case EEPROM_READ:
 517         case EEPROM_WRITE:
 518                 return do_eeprom_rw(&dev, action == EEPROM_READ,
 519                                     addr, off, cnt);
 520 #ifdef CONFIG_CMD_EEPROM_LAYOUT
 521         case EEPROM_PRINT:
 522                 return do_eeprom_print(&dev, layout_ver);
 523         case EEPROM_UPDATE:
 524                 return do_eeprom_update(&dev, layout_ver,
 525                                         field_name, field_value);
 526 #endif
 527         default:
 528                 return CMD_RET_USAGE;
 529         }
 530 }
 531
 532 #ifdef CONFIG_EEPROM_LAYOUT_VERSIONS
 533 #define EEPROM_LAYOUT_SPEC      "[-l <layout_version>] "
 534 #else
 535 #define EEPROM_LAYOUT_SPEC      ""
 536 #endif
 537
 538 #if CONFIG_IS_ENABLED(I2C_EEPROM)
 539 # define EEPROM_DEV_SPEC        "[device_specifier]"
 540 #else
 541 # define EEPROM_DEV_SPEC        "[[bus] devaddr]"
 542 #endif
 543
 544 U_BOOT_CMD(
 545         eeprom, 8,      1,      do_eeprom,
 546         "EEPROM sub-system",
 547 #if CONFIG_IS_ENABLED(I2C_EEPROM)
 548         "list\n"
 549         "eeprom "
 550 #endif
 551         "read  " EEPROM_DEV_SPEC " addr off cnt\n"
 552         "eeprom write " EEPROM_DEV_SPEC " addr off cnt\n"
 553         "       - read/write `cnt' bytes from `devaddr` EEPROM at offset `off'"
 554 #ifdef CONFIG_CMD_EEPROM_LAYOUT
 555         "\n"
 556         "eeprom print " EEPROM_LAYOUT_SPEC EEPROM_DEV_SPEC "\n"
 557         "       - Print layout fields and their data in human readable format\n"
 558         "eeprom update " EEPROM_LAYOUT_SPEC EEPROM_DEV_SPEC " field_name field_value\n"
 559         "       - Update a specific eeprom field with new data.\n"
 560         "         The new data must be written in the same human readable format as shown by the print command."
 561 #endif
 562 #if CONFIG_IS_ENABLED(I2C_EEPROM)
 563         "\n\n"
 564         "DEVICE SPECIFIER - the eeprom device can be specified\n"
 565         "  [dev_name] - by device name (devices can listed with the eeprom list command)\n"
 566         "  [[bus] devaddr] - or by I2C bus and I2C device address\n"
 567         "If no device specifier is given, the first driver-model found device is used."
 568 #endif
 569 #ifdef CONFIG_EEPROM_LAYOUT_VERSIONS
 570         "\n\n"
 571         "LAYOUT VERSIONS\n"
 572         "The -l option can be used to force the command to interpret the EEPROM data using the chosen layout.\n"
 573         "If the -l option is omitted, the command will auto detect the layout based on the data in the EEPROM.\n"
 574         "The values which can be provided with the -l option are:\n"
 575         CONFIG_EEPROM_LAYOUT_HELP_STRING"\n"
 576 #endif
 577 );